First check your local shelter. Thats where I found Rocky. 1 week after turning my doberman into DRU there was a dobe in the local shelter who I visited with and brought gifts to feel better about my loss. Almost offered to foster her. My husband had more sense than me and put an end to that. I admit I was obsessed on getting another dog.
Dobermans- Doberman Rescue Unlimited
http://dru.org/